Power transmission unit of an industrial robot arm



FIG. 1 is a perspective view of power transmission unit of an industrial robot arm showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is an enlarged cross-sectional view taken along line 8-8 in FIG. 5 with the internal structure omitted.

The broken lines illustrate portions of the power transmission unit of an industrial robot arm and form no part of the claimed design. 

CLAIM The ornamental design for power transmission unit of an industrial robot arm, as shown and described. 